Nitrate  - For an anion to move into a non-woody root, an anion must exude from the root.  The most common anion going in is nitrate and the most common anion going out is bicarbonate, and to a lesser amount, hydroxyl.  Nitrate and phosphate ions are Mack trucks.  Ammonium and potassium cations are fast sports cars.  (See A TOUCH OF CHEMISTRY, SHIGO, 1996)

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